(19)

(11)

EP 3 918 778 A1

(12)

(43) Date of publication: 08.12.2021 Bulletin 2021/49 (21) Application number: 19913952.8 (22) Date of filing: 08.10.2019

(51) International Patent Classification (IPC):  H04M 1/725(2021.01) (86) International application number: PCT/CN2019/109938 (87) International publication number: WO 2020/155663 (06.08.2020 Gazette 2020/32)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR Designated Extension States: BA ME Designated Validation States: KH MA MD TN (30) Priority: 02.02.2019 CN 201910107399 (71) Applicant: BOE TECHNOLOGY GROUP CO., LTD. Beijing 100015 (CN)	(72) Inventor: LIU, Cheng Beijing 100176 (CN) (74) Representative: Hoffmann Eitle  Patent- und Rechtsanwälte PartmbB Arabellastraße 30 81925 München 81925 München (DE)